I curbed one of my recently purchased 18 inch rims. The damage isn't "that" bad but in my eyes (call me a perfectionist) I would like to have it either repaired or consider using it as a full spare replacement and put it under the trunk and buy a new rim and tire. Any thoughts as to fitmet in the trunk compartment? I know that the lexus is300 can fit a full 17 inch rim and tire down there. I personally would never feel safe using the provided doughnut so I wouldn't mind a full spare. Care to comment?